  !(function(doc, win) {
	 var docEle = doc.documentElement,
            evt = "onorientationchange" in window ? "orientationchange" : "resize",
            fn = function() {
                var width = docEle.clientWidth;
                width && (docEle.style.fontSize = 16 * (width / 320) + "px");
            };

        win.addEventListener(evt, fn, false);
        doc.addEventListener("DOMContentLoaded", fn, false);

    }(document, window));